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High-Efficiency Perovskite Light-Emitting Diodes with Synergetic Outcoupling Enhancement
- Source :
- Advanced materials (Deerfield Beach, Fla.). 31(24)
- Publication Year :
- 2019
-
Abstract
- Perovskite light-emitting diodes (PeLEDs) show great application potential in high-quality flat-panel displays and solid-state lighting due to their steadily improved efficiency, tunable colors, narrow emission peak, and easy solution-processing capability. However, because of high optical confinement and nonradiative charge recombination during electron-photon conversion, the highest reported efficiency of PeLEDs remains far behind that of their conventional counterparts, such as inorganic LEDs, organic LEDs, and quantum-dot LEDs. Here a facile route is demonstrated by adopting bioinspired moth-eye nanostructures at the front electrode/perovskite interface to enhance the outcoupling efficiency of waveguided light in PeLEDs. As a result, the maximum external quantum efficiency and current efficiency of the modified cesium lead bromide (CsPbBr3 ) green-emitting PeLEDs are improved to 20.3% and 61.9 cd A-1 , while retaining spectral and angular independence. Further reducing light loss in the substrate mode using a half-ball lens, efficiencies of 28.2% and 88.7 cd A-1 are achieved, which represent the highest values reported to date for PeLEDs. These results represent a substantial step toward achieving practical applications of PeLEDs.
Details
- ISSN :
- 15214095
- Volume :
- 31
- Issue :
- 24
- Database :
- OpenAIRE
- Journal :
- Advanced materials (Deerfield Beach, Fla.)
- Accession number :
- edsair.doi.dedup.....421cc5fdd3994b477242f79e89a7d4e8